/Engine/Source/Runtime/GeometryCore/Public/Selections/MeshConnectedComponents.h
Calculation functions. Call these to calculate different types of Components. Find all connected triangle components of the Mesh and store in Components array. Triangle connectivity is based on edge connectivity, ie bowtie-vertices are not connections between triangles.
void FindConnectedTriangles ( [TFunction](API\Runtime\Core\GenericPlatform\TFunction)< bool(int32, int32)> TrisConnectedPredicate )